Derivatives (Details) (Cash flow hedge, USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Aug. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			$ 20	$ 21	$ (92)	$ 22
Gain (Loss) on Hedged Item Recognized in Income			58	78	(104)	66
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges			15		15
The time period estimated for the anticipated transfer of gains (losses), net from accumulated other comprehensive income into earnings					12 months
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			0	0	0	0
Foreign currency forward/option contracts
Derivatives in Cash Flow Hedging Relationships
Maximum length of time hedged in cash flow hedge					12 months
Derivative notional amount			7,400		7,400
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			(39)	(38)	2	(20)
Foreign currency forward/option contracts | Cost of Sales
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income			1	22	(8)	31
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			0	0	0	0
Foreign currency forward contracts
Derivatives in Cash Flow Hedging Relationships
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			59	57	(93)	45
Foreign currency forward contracts | Interest expense
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income			59	58	(94)	45
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			0	0	0	0
Commodity price swap contracts
Derivatives in Cash Flow Hedging Relationships
Maximum length of time hedged in cash flow hedge					12 months
Derivative notional amount			22		22
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			0	2	(1)	(3)
Commodity price swap contracts | Cost of Sales
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income			(1)	(1)	(1)	(9)
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			0	0	0	0
Interest rate swap contracts
Derivatives in Cash Flow Hedging Relationships
Derivative notional amount		400
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative	(7)		0	0	0	0
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	(4)		(3)		(3)
Term of interest rate swap		5 years
Interest rate swap contracts | Fixed rate Medium-term note due 2016
Derivatives in Cash Flow Hedging Relationships
Principal amount	1,000
Term of debt instrument	5 years
Interest rate swap contracts | Interest expense
Derivatives in Cash Flow Hedging Relationships
Gain (Loss) on Hedged Item Recognized in Income			(1)	(1)	(1)	(1)
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			$ 0	$ 0	$ 0	$ 0